var zoo1 = new zoo();

        zoo1.animals = new List<animal>();  
        zoo1.animals.Add(new cat());  
        zoo1.animals.Add(new dog());

        Stopwatch sw1 = new Stopwatch();  
        sw1.Start();  
        string ss = "";  
        for (int i = 0; i < 1000000; i++)  
        {  
            ss = Newtonsoft.Json.JsonConvert.SerializeObject(zoo1);  
        }

        sw1.Stop();

        Console.WriteLine("Newtonsoft s1:" + sw1.ElapsedMilliseconds);

        sw1.Restart();

        sw1.Start();  
        zoo zoo2 = null;  
        for (int i = 0; i < 1000000; i++)  
        {  
            zoo2 = Newtonsoft.Json.JsonConvert.DeserializeObject<zoo>(ss);  
        }

        sw1.Stop();

        Console.WriteLine("Newtonsoft d1:" + sw1.ElapsedMilliseconds);

        sw1.Restart();

        string ss1 = "";  
        sw1.Start();  
        for (int i = 0; i < 1000000; i++)  
        {  
            ss1 = fastJSON.JSON.ToJSON(zoo1);  
        }

        sw1.Stop();  
        Console.WriteLine("fastJSON d1:" + sw1.ElapsedMilliseconds);

        sw1.Restart();

        sw1.Start();  
        zoo zoo3 = null;  
        for (int i = 0; i < 1000000; i++)  
        {  
            zoo3 = fastJSON.JSON.ToObject<zoo>(ss1);  
        }

        sw1.Stop();

        Console.WriteLine("fastJSON d1:" + sw1.ElapsedMilliseconds);

        Thread.Sleep(-1);

　release模式

debug模式

附注. fastJson还有特性，反序列化之后的zoo3中的两个animal的类型分别为cat和dog。但是其他的json'库都没有实现这个特性。